Diablo 2 lord of destruction account help please!

So I created a new account today since ladder reset and a friend gave me a ber and jah to create a enigma. I went to my class today and I came home to log in and my original account showed up because my brother decided to play on my account and the new one was not there. Is there anyway I can give you my IP address and see what accounts I logged into today? I know the password I just need the account and I didn't put in my email addres which was very very stupid because I was in a hurry. So is it possible to look up my account name . I know it starts with STL-TH somthing I believe or I'm screwed lol.